"use strict";

const Track = require('./track');

class SqliteBackend {
  constructor(config, db) {
    this.config = config;
    this.db = db;
  }

  find(tag, callback) {
    this.db.run("INSERT INTO tags (tag) VALUES (?)", tag);
    this.db.get("SELECT uuid, tag, label FROM library WHERE tag = ? AND _ROWID_ >= (abs(random()) % (SELECT max(_ROWID_) FROM tags)) LIMIT 1", tag, (err, row) => {
      if (typeof row === 'undefined') {
        return callback();
      }
      callback(new Track(row['tag'], row['uuid'], row['label']));
    });
  }
}

module.exports = function(config, db) {
  return new SqliteBackend(config, db);
};

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